Make removal of queued items undoable

1 files changed, 135 insertions, 0 deletions

diff --git a/src/de/danoeh/antennapod/util/UndoBarController.java b/src/de/danoeh/antennapod/util/UndoBarController.java
new file mode 100644
index 000000000..e726717a1
--- /dev/null
+++ b/src/de/danoeh/antennapod/util/UndoBarController.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2012 Roman Nurik
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package de.danoeh.antennapod.util;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Parcelable;
+import android.text.TextUtils;
+import android.view.View;
+import android.view.ViewPropertyAnimator;
+import android.widget.TextView;
+
+import de.danoeh.antennapod.R;
+
+public class UndoBarController {
+    private View mBarView;
+    private TextView mMessageView;
+    private ViewPropertyAnimator mBarAnimator;
+    private Handler mHideHandler = new Handler();
+
+    private UndoListener mUndoListener;
+
+    // State objects
+    private Parcelable mUndoToken;
+    private CharSequence mUndoMessage;
+
+    public interface UndoListener {
+        void onUndo(Parcelable token);
+    }
+
+    public UndoBarController(View undoBarView, UndoListener undoListener) {
+        mBarView = undoBarView;
+        mBarAnimator = mBarView.animate();
+        mUndoListener = undoListener;
+
+        mMessageView = (TextView) mBarView.findViewById(R.id.undobar_message);
+        mBarView.findViewById(R.id.undobar_button)
+                .setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View view) {
+                        hideUndoBar(false);
+                        mUndoListener.onUndo(mUndoToken);
+                    }
+                });
+
+        hideUndoBar(true);
+    }
+
+    public void showUndoBar(boolean immediate, CharSequence message, Parcelable undoToken) {
+        mUndoToken = undoToken;
+        mUndoMessage = message;
+        mMessageView.setText(mUndoMessage);
+
+        mHideHandler.removeCallbacks(mHideRunnable);
+        mHideHandler.postDelayed(mHideRunnable,
+                mBarView.getResources().getInteger(R.integer.undobar_hide_delay));
+
+        mBarView.setVisibility(View.VISIBLE);
+        if (immediate) {
+            mBarView.setAlpha(1);
+        } else {
+            mBarAnimator.cancel();
+            mBarAnimator
+                    .alpha(1)
+                    .setDuration(
+                            mBarView.getResources()
+                                    .getInteger(android.R.integer.config_shortAnimTime))
+                    .setListener(null);
+        }
+    }
+
+    public void hideUndoBar(boolean immediate) {
+        mHideHandler.removeCallbacks(mHideRunnable);
+        if (immediate) {
+            mBarView.setVisibility(View.GONE);
+            mBarView.setAlpha(0);
+            mUndoMessage = null;
+            mUndoToken = null;
+
+        } else {
+            mBarAnimator.cancel();
+            mBarAnimator
+                    .alpha(0)
+                    .setDuration(mBarView.getResources()
+                            .getInteger(android.R.integer.config_shortAnimTime))
+                    .setListener(new AnimatorListenerAdapter() {
+                        @Override
+                        public void onAnimationEnd(Animator animation) {
+                            mBarView.setVisibility(View.GONE);
+                            mUndoMessage = null;
+                            mUndoToken = null;
+                        }
+                    });
+        }
+    }
+
+    public void onSaveInstanceState(Bundle outState) {
+        outState.putCharSequence("undo_message", mUndoMessage);
+        outState.putParcelable("undo_token", mUndoToken);
+    }
+
+    public void onRestoreInstanceState(Bundle savedInstanceState) {
+        if (savedInstanceState != null) {
+            mUndoMessage = savedInstanceState.getCharSequence("undo_message");
+            mUndoToken = savedInstanceState.getParcelable("undo_token");
+
+            if (mUndoToken != null || !TextUtils.isEmpty(mUndoMessage)) {
+                showUndoBar(true, mUndoMessage, mUndoToken);
+            }
+        }
+    }
+
+    private Runnable mHideRunnable = new Runnable() {
+        @Override
+        public void run() {
+            hideUndoBar(false);
+        }
+    };
+}